Abstract: An unbonded post-tensioning system and method are disclosed, as well as concrete structures utilizing an unbonded post-tensioning system. A void is created and maintained through the concrete structure in which at least one stainless steel strand is placed and tensioned. The void containing the cable is maintained unfilled. Strands may thus be removed and inspected, and reinserted or replaced as necessary. The invention has the advantages of reducing corrosion and permitting non-destructive inspection and replacement of individual strands.